Subject + Be verb(am,is,are,was,were) + in/at/on

►Describes an action you are doing.

Most commonly, you would use the word 'in' when entering a physical location or you are in a physical location such as a room or a building.

Here are some examples:

  1. I am in the shower.
  2. I am in the lobby.
  3. I was in the lobby.
  4. He was in the shower.
  5. He is in a car.
  6. He is in a house.
  7. They are in a school.

♦Using the word 'at' helps tell someone where you currently are. The difference between 'at' and 'in' is that the physical location is general.

Here are some examples:

  1. I am at the grocery.
  2. I am at the mall.
  3. I am at the doctor's office.
  4. He is at the park.
  5. They are at the airport.

♦However, in some cases you can use 'at' and 'in' interchangeably.

Here are some examples:

  1. I am at the mall.
  2. I am in the mall.
  3. He is at the park.
  4. He was in the park.
  5. I am at the grocery.
  6. I am in the grocery.

♦Using the word 'on' is referring to a non physical location such as your time being utilized by something else.

Here are some examples:

  1. I am on the phone.
  2. I am on my computer.
  3. I am on a bus.
  4. He is on computer.
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